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ale4655 [162]
3 years ago
15

Help me pls T-T (Question down below0

Chemistry
2 answers:
Degger [83]3 years ago
8 0

automnal equinox - september 22

vernal equinox - march 21

longest day in Northern Hemisphere - june 21

longest day in Southern Hemisphere - december 22

Lera25 [3.4K]3 years ago
4 0

Explanation:

antumnal equinox - march 21

vernal eqinox - june 21

longest day in northern hemisphere - September 22

longest day in southern hemisphere - december 22

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Is Pb(NO3)2 soluble or insoluble?
Sedaia [141]

Answer: it is soluble

Explanation: nitrates are soluble.

4 0
4 years ago
Abigail obtained 18.9 grams of calcium carbonate after performing a reaction. From her calculations, she knew she should have ob
zysi [14]

Answer:Percent error= 90.9%

Explanation:

Percent error or percentage error is defined as the  percentage of the  difference between a measured value usually from an experiment and an exact  value in comparison to the exact number.

its formula is thus

Percent error = experimental value - exact or actual value /exact value x 100

=(18.9 - 9.9 /9.9 ) x 100= 9/9.9) x 100

0.909 x 100 = 90.90 = 90.9%

5 0
4 years ago
1. Name two organisms that are competing for energy and explain HOW they compete.​
lutik1710 [3]

Answer:

There could be a few answers for this question, but my answer would be two different plants. Maybe a bush on the ground fighting for the energy of the sun with a tall tree. Leaves collect the energy from the sun and convert it to energy usable for the plant. a bush on the ground would be fighting for the sunlight with a tall tree.

5 0
3 years ago
A gas in a piston–cylinder assembly undergoes a compression process for which the relation between pressure and volume is given
m_a_m_a [10]

Answer:

1.

A=69.8\frac{bar}{m^6}\\\\ B=0.00302bar*m^6

2. W=-8.2kPa

Explanation:

Hello,

1. In this case, for the given p-V equation, one could use the two states to form a 2x2 linear system of equations in terms of A and B:

\left \{ {{0.1^2A+0.1^{-2}B=1} \atop {0.04^2A+0.04^{-2}B=2}} \right.

\left \{ {{0.01A+100B=1} \atop {0.0016A+625B=2}} \right

Whose solution by any method for solving 2x2 linear system of equations (elimination, reduction or substitution) is:

A=69.8\frac{bar}{m^6}\\\\ B=0.00302bar*m^6

2. Now, for us to compute the work, we must first compute n, as the power relating the pressure and volume for this process:

P_1V_1^n=P_2V_2^n\\\\\frac{P_1}{P_2}=(\frac{V_2}{V_1}  )^n\\\\\frac{1bar}{2bar}= (\frac{0.04m^3}{0.1m^3}  )^n\\\\0.5=0.4^n\\\\n=\frac{ln(0.5)}{ln(0.4)} =0.7565

Now, we compute the work:

W=\frac{P_2V_2-P_1V_1}{1-n} =\frac{2bar*0.04m^3-1bar*0.1m^3}{1-0.7565} \\\\W=-0.082bar*m^3*\frac{1x10^2kPa}{1bar}\\ \\W=-8.2kPa

Regards.

8 0
4 years ago
Sediment spreads horizontality and it goes from youngest on top to oldest on bottom. When sediment deposits in water, it also sp
Ad libitum [116K]
My answer will be C. Law of Original lateral continuity. :)
7 0
3 years ago
Read 2 more answers
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